package Base;

class Case1{
    public Case1 (String s){
        System.out.println("B");
    }
}

//没有帮父类初始化（super)
public class Dervied extends Case1{
    public Dervied (String s){
        super("D");
        System.out.println("D");
    }

    public static void main(String[] args) {
        new Dervied("C");
    }
}
